Adjust cantilever brakes
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  1. #1
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    Adjust cantilever brakes

    I have already set the balance of the cable so both pads contact the rim at the same time,
    switched to koolstop pads and it is longer than stock.
    I am not doing special toe-in but more flat engagement.
    The front is somewhat responsive but the rear still kind of glides
    Is there any more that I could do to make the brakes more powerful.

  2. #2
    xxl
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    This link may help: http://www.sheldonbrown.com/cantilever-geometry.html

    Note the link contained, on "Adjusting Cantilevers," as well as the explanation about setting up narrow-profile cantis. Good luck.

  3. #3
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    What brakes are you using? Post pics of the installed rear brake if possible for more help too.
    Cyclists really need to learn a little Rule #5.

  4. #4
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    tektro cr520

  5. #5
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    How high is the stradle wire hangar above the pivot for the cantilever? Is it possible to get it higher. The higher the cable hangar is the more leverage the brakes will have for braking power. Remember there is less than 1/2" of cable pull, so the hangar really doesn't need to be that far below the cable stop.
    Cyclists really need to learn a little Rule #5.

  6. #6
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    Quote Originally Posted by spookyload View Post
    How high is the stradle wire hangar above the pivot for the cantilever? Is it possible to get it higher. The higher the cable hangar is the more leverage the brakes will have for braking power. Remember there is less than 1/2" of cable pull, so the hangar really doesn't need to be that far below the cable stop.


    Actually, the lower the hanger the more leverage. Its all about Yoke angle. The lower the yoke angle the better the leverage.




    Yoke Angle
    (Degrees) Mechanical
    Advantage
    90 1
    80 1.015
    70 1.063
    60 1.15
    50 1.31
    40 1.55
    30 2
    20 2.92
    10 5.76
    5 11.47
    0 Infinity!

    A 90 degree yoke angle would result from an infinitely long transverse cable, such that each side of the cable was running vertically down from the cable yoke.

    A 0 degree yoke angle would represent the shortest possible transverse cable, running in a perfect straight line along the top of the cable yoke.

    As you can see from the table, the shorter and straighter the transverse cable, the more difference it makes. This effect is what makes it possible to make a low-profile brake with good stopping power.
    You can't fix stupid.

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  7. #7
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    this varies...

    Actually in practice this can vary somewhat. I have cantis that stick straight out--old Mafac design--and having a slightly higher hanger will often improve things if the original set-up was low.

    Quote Originally Posted by frdfandc View Post
    Actually, the lower the hanger the more leverage. Its all about Yoke angle. The lower the yoke angle the better the leverage.
    ...the shorter and straighter the transverse cable, the more difference it makes. This effect is what makes it possible to make a low-profile brake with good stopping power.

  8. #8
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    so try it higher or lower?

  9. #9
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    What is the position of the hanger now?
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  10. #10
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    Hey, it turns out the front is about an inch higher. The rear is kind of low.
    On the traverse wire I can back it about half an inch to get a little more on the triangle.
    So the best I could do is that and then see how high the hanger can get.

    BTW you can buy a new traverse cable at LBS easily right.
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  11. #11
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    That looks pretty good as far as height goes. Maybe a tad lower IMO. That is about the height I set up cantilevers on customer bikes. Then I adjust accordingly for feel.

    Might want to start dialing in feel with the barrel adjuster there. Get it to where it feels good and leave it alone. If/when you need to remove the rear tire, back the barrel adjuster back down, take off the straddle cable and remove wheel. Opposite when reinstalling the rear wheel.

    You don't want the brakes to lock up, that doesn't stop you. You want modulation and braking power. Locking the brakes up is an indication of poor braking power. Adjust them so that the brakes will slow you down. And use the rear to supplement the fronts. The front brakes provide most of your braking power.
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

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